Search for high energy gamma ray pulsar emission with the CELESTE Experiment

The CELESTE experiment detects gamma rays in the 50 GeV range by measuring the atmospheric ˇCerenkov light collected using 40 of the heliostats of the Th´emis central tower solar facility. We have recently announced an upper limit for the exponential energy cut-off in the spectrum of the Crab pulsar dN dE = KE-γ e- E E0 with E0 = 32GeV . This result was obtained with the CELESTE standard analysis used for the study of the continuous emission from the nebula. We discuss here an analysis of CELESTE data which preserves low energy events in order to study the pulsed component. We also present very preliminary results for PSR1951+32 which may be the most promising candidate for the first detection of a gamma ray pulsar by a ground based experiment.